Machine code: Difference between revisions

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However, it is designed for embedding and we can therefore ask the host to do this for us. Here, we use a host program written in C, the language which Wren itself is written in.

<syntaxhighlight lang="~~ecmascript~~">/* ~~machine_code~~.wren */

<syntaxhighlight lang="wren">/* Machine_code.wren */

class C {

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<br>

We now embed this Wren script in the following C program, compile and run it.

<syntaxhighlight lang="c">~~#include~~ ~~<stdlib~~.h>

<syntaxhighlight lang="c">/* gcc Machine_code.c -o Machine_code -lwren -lm */

#include <stdlib.h>

#include <stdio.h>

#include <string.h>

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void C_runMachineCode(WrenVM* vm) {

/* unpack arguments passed from Wren */

int *len;

int len;

const char *code = wrenGetSlotBytes(vm, 1, len);

const char *code = wrenGetSlotBytes(vm, 1, &len);

unsigned char a = (unsigned char)wrenGetSlotDouble(vm, 2);

unsigned char b = (unsigned char)wrenGetSlotDouble(vm, 3);

/* obtain result */

unsigned char c = rmc_helper(code, a, b, *len);

unsigned char c = rmc_helper(code, a, b, len);

/* return result to Wren */

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WrenVM* vm = wrenNewVM(&config);

const char* module = "main";

const char* fileName = "~~machine_code~~.wren";

const char* fileName = "Machine_code.wren";

char *script = readFile(fileName);

WrenInterpretResult result = wrenInterpret(vm, module, script);